Definitions Anti Description given to two substitutents attached to adjacent atoms when their bonds are at 180 with respect to each other. Syn Description given to two substitutents attached to adjacent atoms when their bonds are at 0o with respect to each other. Gauche -Description given to two substitutents attached to adjacent atoms when their bonds are at 600 with respect to each other.Definitions • Anti - Description given to two substitutents attached to adjacent atoms when their bonds are at 180o with respect to each other. • Syn - Description given to two substitutents attached to adjacent atoms when their bonds are at 0o with respect to each other. • Gauche - Description given to two substitutents attached to adjacent atoms when their bonds are at 60o with respect to each other